Renesas M34286T2-CPE User Manual page 54

M34286T2-CPE User's Manual
Note on Watchdog Timer:
• With this product, the watchdog timer is running. The watchdog timer initialization cycle can be verified
by observing the waveform at the check pin (WRST) of the emulator. For details, refer to "2.5
Watchdog Timer Initialization Cycle Check Pin" (page 28).
• With this emulator system, the watchdog timer function cannot be invalidated.
If an MCU reset occurs by the watchdog timer, the emulator will not operate properly. In this case,
perform a reset input from the emulator debugger or reset the emulator system.
Also, after a reset by the watchdog timer occurs, the problems below may appear in the emulator
debugger:
(1) Only information of address 0000h is displayed in the results of real-time trace.
(2) When a user program is forcibly stopped, the value of program counter is the same as when started.
(3) The software break and hardware break do not occur in the program.
While a user program is stopped, the WRST instruction is always executed in order not to cause a reset
by the watchdog timer.
Notes on Port I/O Timings:
• Port input timings
Port input timings are the same as with the actual MCUs.
• Port I/O timings
Port I/O timings are different from those of the actual MCUs for the following ports that are configured
with port emulation circuits:
- D0-D7
- G0-G3
- E0
With the actual MCUs, changes occur at the beginning of the T3 state of an output instruction. With this
product, changes occur at the beginning of the T2 state of the next output instruction. Figure 4.1 shows
the port I/O timing for this product.
The output timings excluding the indicated above are the same as with the actual MCUs.
Instruction
Port output of
actual MCU
Port output of
this product
Figure 4.1 Port I/O timings
• As a pitch converter board and other devices are used between the evaluation MCU and the user system,
some characteristics are slightly different from those of the actual MCU. Therefore, be sure to evaluate
your system with an evaluation MCU.
R20UT0214EJ0200 Rev.2.00
Sep 16, 2010
IMPORTANT
Port output instruction
Cycle T1
T2
XIN
Next instruction
T3 T4 T1
4. Hardware Specifications
T2
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